Area of basic shapes

Review of skills from the past.

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AREA of a basic shape

The amount of surface space a flat object occupies

Defined as

Area

REMEMBER

​Base and height will always make a 90* (right) angel

Defined as: set of points all equal distance from a center point

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Circle

Circle

Multiple Choice

what is the formula for finding area of a circle

• C = π r²

• A = π r²

• A = π r² / 2

• C = 2 π r

Defined as:

all 4 sides are the same size
AND
all 4 angles each equal 90*

​Squares

​Squares

Multiple Choice

Susan wants to fertilize her square garden that has a side measure of 8 ft. What is the area of the garden that she wants to fertilize?

• 8 sq. ft.

• 21 sq. ft.

• 64 sq. ft.

• 44 sq. ft

​Defined as opposites are equal size and paralell

All angles equal 90*

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Rectangles

Rectangles

Multiple Choice

Mrs. Davis wanted to cover the classroom with new carpet. If the length of the classroom was 12 feet and the width was 8 feet. How much carpet would she need to buy?

• 20 feet
• 40 ft
• 96 square feet
• 40 square feet

Defined as 4 sided "rectangular" figure with opposite sides are congruent and parallel

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Parallelogram

Parallelogram

Multiple Choice

What would you do to find the Area of this Parallelogram?

• Multiply 10 in. times 9 in.

• Multiply 15 in. times 10 in.

• Multiply 15 in. times 9 in.

​A shape with 3 sides and 3 angles

The SUM of the measure of the angles is 180*

Triangle

Triangle

Multiple Choice

We know we can use ANY triangle side as the base, so long as we have a height marked perpendicular (at a right angle) to it.

Which side would be the best to use as the base of the triangle, because it's connected to the height by a right angle?

• 18 cm

• 14 cm

• 8 cm

• 6 cm

Multiple Choice

Which expression below will find the Area of this triangle?

• $$\frac{\left(6\ \times8\right)}{2}$$

• $$\frac{\left(6\ \times10\right)}{2}$$

• $$\frac{\left(8\times14\right)}{2}$$

• $$\frac{\left(6\ \times14\right)}{2}$$

4 sided shape with exactly one pair of parallel sides

Parallel side are the bases

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​Trapezoid

​Trapezoid

Multiple Choice

What is the height of this trapezoid

• 7 ft

• 11 ft

• 6 ft

• 15 ft