Advanced Mathematics Primary 5 Area of Triangle

Nadia cuts a triangular kite from a rectangular sheet of cloth. The triangle has a base of 28 cm and a height of 15 cm. She sews a rectangular label measuring 4 cm by 5 cm onto the surface of the kite. What is the area of the kite that is NOT covered by the label?

A 190 cm²
B 210 cm²
C 200 cm²
D 400 cm²
Show Worked Solution

Worked Solution

Step 1: Find the area of the triangular kite. Area = ½ × base × height = ½ × 28 × 15 = ½ × 420 = 210 cm² Step 2: Find the area of the rectangular label. Area of label = 4 × 5 = 20 cm² Step 3: Subtract the label area from the kite area. Uncovered area = 210 − 20 = 190 cm² Answer: 190 cm² Answer: 190 cm²

Correct answer: 190 cm²

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