256 sq. cm.
250 sq. cm.
128 sq. cm.
128 sq. cm.
X and Y are centres of circles of radii 9cm and 2 cm respectively, XY = 17cm. Z is the centre of a circle of radius r cm which touches the above circles externally. Given that the value of r is
13 cm
6 cm
9 cm
9 cm
If the radii of two circles be 6 cm and 3 cm and the length of the transverse common tangent be 8 cm, then the distance between the two centres is
The ratio between the number of sides of two regular polygons is 1 : 2 and the ratio between their interior angles is 2 : 3. The number of sides of these polygons is respectively.
6, 12
5, 10
4, 8
4, 8
Two posts are x metres apart and the height of one is double that of the other. If from the mid-point of the line joining their feet, an observer finds the angular elevations of their tops to be complementary, then the height (in metres) of the shorter post is
If then the value of
is
B.
In a right-angled triangle, XYZ, right-angled at Y, If and XZ - YZ = 2, then sec X + tan X is