Formulas
Rectangles & Parallelograms
Triangles
Trapezoids
Composites
100
A = lw
What is the formula of a rectangle.
100
The measurements of a rectangle with 25 miles in length and 5 miles in width.
What is 125 miles squared?
100
This is how tall the triangle is measured from the base.
What is the height?
100
This is how tall the trapezoid is measured from the base.
What is the height?
100
You can find the area of composite figures (irregular polygons) by breaking them apart into rectangles, parallelograms, and triangles.
How do you find the area of a composite figure.
200
A = bh
What is the formula of a parallelogram?
200
This rectangle has a length of 5 mm and a width of 11 mm.
What is 55 centimeters squared?
200
This is the side of a triangle which is perpendicular to the altitude. The height of a triangle is measured from this.
What is the base?
200
There are two of these in the formula to find the area of a trapezoid.
What is the base?
200
You can find the area of this composite (house) by finding the area of the triangle and rectangle then adding the two together.
How do you find the area of a composite that looks like a house?
300
A = 1/2 bh
What is the area of a triangle?
300
The length is 5 meters and the width is 4 meters.
What is 20 meters squared?
300
A = 1/2 bh
What is the formula to find the area of a triangle?
300
This trapezoid has a height of 6 meters. The first base is 4 meters and the second base is 6 meters.
What is 30 meters squared?
300
The area of the park that surrounds the fountain is 40. The fountain is 5 feet long and 5 feet wide. The true area of the park 15.
What is the area of the park without the fountain?
400
A = 1/2 h(b1+b2)
What is the area of a trapezoid?
400
This parallelogram has a base of .5 inches and a height of 1.5 inches.
What is 50 inches squared?
400
This triangle has a base of 6 yards and a height of 5 yards.
What is 15 yard squared?
400
This trapezoid has a height of 8 meters. It has two bases with 14 and 10 meters.
What is 96 meters squared?
400
Look on page 363, independent practice problem 4, and find the area.
What is 32 inches squared?
500
You break apart the composite into polygons, then you find the area of each polygon. Finally, you add each area of each composite together.
What is the formula of a composite?
500
This triangle has a base of 10 units and a height of 50 units.
What is 500 units squared?
500
The area of a trapezoid is 1/2h(b1+b2).
What is the formula for the area of a trapezoid?
500
The area of a trapezoid is 1/2h(b1+b2).
What is the formula for the area of a trapezoid?
500
Look on page 363, independent practice problem 5, and find the area.
What is 640 yards squared?
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