How to find the area of a parallelogram - SSAT Upper Level Quantitative (Math)

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Question

A parallelogram has the base length of and the altitude of . Give the area of the parallelogram.

Answer

The area of a parallelogram is given by:

Where is the base length and is the corresponding altitude. So we can write:

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Question

A parallelogram has a base length of which is 3 times longer than its corresponding altitude. The area of the parallelogram is 12 square inches. Give the .

Answer

Base length is so the corresponding altitude is .

The area of a parallelogram is given by:

Where:

is the length of any base
is the corresponding altitude

So we can write:

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Question

The length of the shorter diagonal of a rhombus is 40% that of the longer diagonal. The area of the rhombus is . Give the length of the longer diagonal in terms of .

Answer

Let be the length of the longer diagonal. Then the shorter diagonal has length 40% of this. Since 40% is equal to , 40% of is equal to .

The area of a rhombus is half the product of the lengths of its diagonals, so we can set up, and solve for , in the equation:

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Question

The length of the shorter diagonal of a rhombus is two-thirds that of the longer diagonal. The area of the rhombus is square yards. Give the length of the longer diagonal, in inches, in terms of .

Answer

Let be the length of the longer diagonal in yards. Then the shorter diagonal has length two-thirds of this, or .

The area of a rhombus is half the product of the lengths of its diagonals, so we can set up the following equation and solve for :

To convert yards to inches, multiply by 36:

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Question

The longer diagonal of a rhombus is 20% longer than the shorter diagonal; the rhombus has area . Give the length of the shorter diagonal in terms of .

Answer

Let be the length of the shorter diagonal. If the longer diagonal is 20% longer, then it measures 120% of the length of the shorter diagonal; this is

of , or .

The area of a rhombus is half the product of the lengths of its diagonals, so we can set up an equation and solve for :

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Question

Which of the following shapes is NOT a quadrilateral?

Answer

A quadrilateral is any two-dimensional shape with sides. The only shape listed that does not have sides is a triangle.

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Question

What other shape can a parallelogram be classified as?

Answer

A parallelogram can not be classified as a square because a square has to have equal sides, but a parallelogram can have two different side lengths, as long as the opposite side lengths are equal.

A parallelogram can not be classified as a rectangle because a rectangle has to have angles, and a parallelogram does not.

A parallelogram can not be classified as a triangle because a parallelogram has to have sides and a triangle only has sides.

A parallelogram can not be classified as a rhombus because a rhombus has to have equal sides and a parallelogram does not.

A parallelogram has four sides, and all shapes with four sides are quadrilaterals.

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Question

What is the main difference between a square and a rectangle?

Answer

The only difference between a rectangle and a square is their side lengths. A square has to have equal side lengths, but the opposite side lengths of a rectangle only have to be equal.

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Question

What two shapes can a square be classified as?

Answer

A square can also be a rectangle and a rhombus because a rectangle has to have at least sets of equal side lengths and a rhombus has to have equal side lengths, like a square, and at least sets of equal angles.

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Question

What is the main difference between a triangle and a rectangle?

Answer

Out of the choices given, the only characteristic used to describe shapes is the number of sides. A triangle has sides and a rectangle has sides.

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Question

Which two shapes have to have right angles?

Answer

By definition, the only two quadrilaterals that have to have right angles, are the square and the rectangle.

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Question

Which of the shapes is NOT a quadrilateral?

Answer

A quadrilateral is a sided shape. The only shape listed that does not have sides is a hexagon, which has sides.

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Question

Which of the following shapes is NOT a parallelogram?

Answer

A rectangle, square, and rhombus can all be classified as a parallelogram because each shape has opposite side lengths that are equal. A kite does not.

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Question

What is the difference between a trapezoid and a isosceles trapezoid?

Answer

By definition, an isosceles trapezoid has to have equal base angles, but a trapezoid does not have to have equal angles.

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Question

Which shape is NOT a quadrilateral?

Answer

A quadrilateral has to have sides, a circle does not have any sides.

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Question

Parallelogram

Figure NOT drawn to scale.

The above depicts Rhombus , which has perimeter 80. .

Give the area of Rhombus .

Answer

The area of any parallelogram is the product of the length of its base and that of a corresponding altitude. We can take as a base and perpendicular as an altitude.

All four sides of a rhombus have the same length, so we can find by dividing the perimeter - the sum of the lengths of the four sides - by 4:

Now multiply the lengths of this base and the altitude to get the area:

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