Let p- q and r denote the lengths of the sides QR- PR and PQ of a triangle PQR respectively- Then p cos 2 R - 2- r cos 2 P - 2A- equals p-q-r-4B- cannot be determined with the given dataC- equals qD- equals p-q-r-2

The correct option is D equals p+q+r2 ...

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Standard XII

Mathematics

Solution of Triangle

Let p, q and ...

Question

Let p, q and r denote the lengths of the sides QR, PR and PQ of a triangle PQR respectively. Then p cos²(R/2)+r cos²(P/2)

equals $q$

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equals $\frac{p + q + r}{2}$

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equals $\frac{p + q + r}{4}$

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cannot be determined with the given data

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Solution

The correct option is B
equals $\frac{p + q + r}{2}$

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Let p, q and r denote the lengths of the sides QR, PR and PQ of a triangle PQR respectively. Then p cos2(R/2)+r cos2(P/2)

The correct option is B equals p+q+r2

Let p, q and r denote the lengths of the sides QR, PR and PQ of a triangle PQR respectively. Then p cos²(R/2)+r cos²(P/2)

The correct option is B
equals $\frac{p + q + r}{2}$