find the area of quadrilateral ABCD, in which BM perpendicular to AC, DN perpendicular to AC, AC=20 cm, BM=3 cm and DN=2 cm.
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50cm²
Step-by-step explanation:
AREA OF ABCD = AREA OF ABC + AREA OF ADC
= ½ × AC × BM
= ½ × 20 × 3
= 10 × 3
= 30 cm² → ABC
+
= ½ × 20 × 2
= 20 × 1
= 20 cm² → ADC
ABC + ADC
= 30cm² + 20cm²
= 50cm²
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