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pprajwal05
@pprajwal05
July 2022
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Questions no. 8 plz help Ch 20 Area and Perimeter of Plane Figures I only need the area BC = 5cm and Perimeter = 36cm
Answers & Comments
AbyMatt
In triangle DBC
1/2* base* height
1/2*5*12
30cm^2
triangle ABD
Use herons formula...
ie p=1side+2side+3side/2
above is herons formula...
therefore p= 10+12+8/2
=15
=39.6863
0 votes
Thanks 1
pprajwal05
ans is 69.7
pprajwal05
got it thx
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Answers & Comments
1/2* base* height
1/2*5*12
30cm^2
triangle ABD
Use herons formula...
ie p=1side+2side+3side/2
above is herons formula...
therefore p= 10+12+8/2
=15
=39.6863