√3cm
√7cm
3cm
7cm
Correct answer is B
PR2 = PQ2 + QR2 - 2(QR)(PQ) COS 120o
PR2 = 12 + 22 - 2(1)(2) x - cos 60o
= 5 - 2(1)(2) x -12
= 5 + 2 = 7
PR = √7cm
Which of the following binary operations is cumulative on the set of integers?...
Solve for y in the equation 10^1 x 5(2y - 2) x 4(y - 1) = 1...
Evaluate (0.142×0.275)7(0.02) to 3 decimal places. ...
Solve the simultaneous equations 2x - 3y = -10, 10x - 6y = -5...
p = |x302y3424| Q = \(\begin{vmatrix} x ...
Make x the subject of the equation s = 2 + t5(x + ⅗y)...
In the diagram, triangle MNR is inscribed in circle MNR, and line PQ is a straight line. ∠M...