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
A.
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
In a right-angled triangle, XYZ, right-angled at Y, If and XZ - YZ = 2, then sec X + tan X is