7th grade - Lesson 25 - composite shapes and SA

Front

What is a composite shape?

Back

A composite shape is a figure that is made up of two or more simple shapes, such as rectangles, triangles, and circles.

Front

How do you calculate the area of a rectangle?

Back

Area = length × width.

Front

What is the formula for the area of a triangle?

Back

Area = (base × height) / 2.

Front

How do you find the area of a circle?

Back

Area = π × radius².

Front

What is surface area?

Back

Surface area is the total area of the surface of a three-dimensional object.

Front

How do you calculate the surface area of a rectangular prism?

Back

Surface Area = 2(length × width + length × height + width × height).

Front

What is the formula for the surface area of a triangular prism?

Back

Surface Area = (Base Area × 2) + (Perimeter of Base × Height).

Front

How do you find the area of a shaded region in a composite shape?

Back

Subtract the area of the unshaded part from the total area of the composite shape.

Front

What is the total surface area of a cylinder?

Back

Total Surface Area = 2πr(h + r), where r is the radius and h is the height.

Front

How do you find the area of a composite figure?

Back

Break the composite figure into simple shapes, calculate the area of each, and then sum them up.