Area of triangle PQR is 100 cm2 (Fig. 9.20). If altitude QT is 10 cm, then its base PR is

Area of triangle PQR = ×PRGiven Area of triangle PQR is 100 cm2100 = ×PR100 = ×PR100 = 5 PR = PRSo PR = 20cm

Q15 of 131 Page 226

Area of triangle PQR is 100 cm² (Fig. 9.20). If altitude QT is 10 cm, then its base PR is

Area of triangle PQR = ×PR

Given Area of triangle PQR is 100 cm²

100 = ×PR

100 = 5 PR

= PR

So PR = 20cm

In reference to a circle the value of is equal to

Circumference of a circle is always

In Fig. 9.21, if PR = 12 cm, QR = 6 cm and PL = 8 cm, then QM is

In Fig. 9.22 ∆MNO is a right-angled triangle. Its legs are 6 cm and8 cm long. Length of perpendicular NP on the side MO is