= (28 - 10) ÷ 3
= 18 ÷ 3
= 6 cm
= 15 cm × 10 cm + 4 × 6 cm × 6 cm
= 150 + 144 cm²
= 294 cm² (D.)
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= (28 - 10) ÷ 3
= 18 ÷ 3
= 6 cm
= 15 cm × 10 cm + 4 × 6 cm × 6 cm
= 150 + 144 cm²
= 294 cm² (D.)