Question

This is part of Zalika's homework

A) Explain the mistake that Zalika made.

B) Work out the correct answer for her. ​

Answer 1

A) She did not covert them in the same unit before taking the difference

B) 72 - (180/100) = 70.2 cm²

Or,

(72×100) - 180 = 7020 mm²

Answer 2

The units of the two shapes are not the same one is in cm the other in mm

Explanation:

1cm=10mm

15÷10=1.5cm

12÷10=1.2cm

1.2×1.5=1.8

72- area of B

Area of B take away the area of A

72- 1.8

Answer=70.2cm