Area of Shapes

What is the formula for the area of a triangle?

• bh

• 1/2 bh

• 1/2 (a+b) h

• 2(bh)

What is the formula for the area of a trapezoid?

• A = 1/2 (a+b) h

• A= bh

• A = 2 (bh)

• A = 1/2 bh

If area of a rectangle is A = bh, why is the area of a triangle A = 1/2 bh?

• Triangles have a base (b) half as long as a rectangle, so we need to find 1/2 bh

• Triangles have a height (h) half as high as a rectangle, so we need to find 1/2 bh

• If you put two equal triangles together you get a rectangle, so 2(1/2(bh)) equals the area of a rectangle (bh)

What shapes can you decompose this shape into?

What is the area of the shape?

• 12ft

• 6ft²

• 6ft

• 12ft²

Calculate the area of the trapezoid in ft2

Calculate the area.

Fill in the missing value ONLY, not the units.

Calculate the area of the circle.

The blue part of the circle makes up how many degrees of the circle?