PQR is an equilateral triangle with side 8cm. on one of its side PR, a right angled triangle PRS is drawn with angle PRS =90 and RS=12cm. Find the area of PQRS
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The fig. will be like this.
Firstly, we will find the area of ∆pqr
area of equi. trialngle= √3/4×a×a
=√3/4×8×8
= 27.71 sq. cm
Now we will find the area of ∆PRS= 1/2 ×b×h
=1/2×12×8
=48 sq. cm
Now add both the Areas= 48+27.71= 75.71 sq. cm
Firstly, we will find the area of ∆pqr
area of equi. trialngle= √3/4×a×a
=√3/4×8×8
= 27.71 sq. cm
Now we will find the area of ∆PRS= 1/2 ×b×h
=1/2×12×8
=48 sq. cm
Now add both the Areas= 48+27.71= 75.71 sq. cm
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