Question

Maggie found the area of the irregular figure by dividing it into a triangle and a rectangle.

A figure can be broken into a rectangle and triangle. The rectangle has a base of 6 centimeters and height of 5 centimeters. The triangle has a base of 3 centimeters and height of 2 centimeters.

Her work is shown below.

Area of rectangle = bh = (6 cm)(5 cm) = 30 Centimeters squared
Area of triangle = bh = (2 cm)(3 cm) = 6 Centimeters squared
Area of entire figure = 30 Centimeters squared + 6 Centimeters squared = 36 Centimeters squared

Which best describes the error that Maggie made?
She didn’t use the correct formula for the area of the triangle.
She didn’t use the correct formula for the area of the rectangle.
She didn’t find the dimensions of the triangle correctly.
She didn’t combine the areas of the triangle and the rectangle correctly.

Answer 1

Answer:

She didn’t use the correct formula for the area of the triangle.

Answer 2

The statement that  best describes the error that Maggie made is (a) She didn’t use the correct formula for the area of the triangle.

How to determine the true statement?

The dimensions are given as:

• Rectangle: Base = 6 cm; Height = 5 cm.
• Triangle: Base = 3 cm; Height = 2 cm

The computations are given as:

• Area of rectangle = bh = (6 cm)(5 cm) = 30cm²
• Area of triangle = bh = (2 cm)(3 cm) = 6cm²

In the above computation, the area of the triangle is wrongly calculated because the wrong formula was applied

Hence, the statement that  best describes the error that Maggie made is (a) She didn’t use the correct formula for the area of the triangle.

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