Give me answer for b
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Answer:
area of fig.ABCDE=arΔabc+arΔace+arΔecd=(140+21√39)/4
Step-by-step explanation:
arΔabc= 1/2 × base×height=1/2×10×2= 10 cm²
arΔecd=1/2×base×height= 1/2×10×5=25 cm²
arΔace=b/4×√4a²-b²=7/4× √400-49=7/4×√351=7/4×3√39=21/4√39cm²
adding all we get=25+10+21/4√39=(100+40+21√39)/4 =(140+21√39)/4
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