Question

answer the question​

Answer 1

Answer:

Group 1 cleaned more by 54m²

Total area cleaned = 306m²

Step-by-step explanation:

Area of Triangle ABC = 1/2 bh

ar(∆ABC) = 1/2 • 40 • 9 = 180m²

Since, we don't know the height of Triangle ADC, we can obtain it by subtracting ar(∆ABC) from Area of trapezium.

ar( trapezium ABCD) = 1/2 [b(1)+b(2)] × h

= 1/2 (40 + 28)×9

= 34 × 9 = 306m²

ar(∆ADC) = ar(trapezium ABCD) - ar(∆ABC)

= 306 - 180 = 126 m²

Here, it is understood that, ar(∆ABC) > ar(∆ADC)

Therefore Group 1 has cleaned 54m² more than Group 2

The total area cleaned = ar(trapezium ABCD) = 306m²