In the figure, the line segment ST is tangent to two circ...
In the figure, the line segment ST is tangent to two circles at S and T. O and Q are the centres of the circles wih OS = 5cm. QT = 2cm and OR = 14cm. Find ST
7 √3cm
12.9cm
√87cm
7cm
Correct answer is B
SQ2 + OS2 = OQ2 + 52 = 142
SQ2 = 142 - 52
196 - 25 = 171
ST2 + TQ2 = SQ2
ST2 + 22 = 171
ST2 = 171 - 4
= 167
ST = √167
= 12.92 = 12.9cm
Find the median of 2, 1, 0, 3, 1, 1, 4, 0, 1 and 2 ...
Solve the simultaneous equations 2x−3y = 2, \(\frac{4}{x} + {\frac{3}{y}}\...
Find the simple interest rate percent per annum at which N1,000 accumulates to N1,240 in 3 years...
The nth term of a sequence is given as 4×3(3−n). Calculate the third term....
Two fair coins are tossed at the same time. what is the probability of getting a head? ...