Given that the side length of a rhombus is the geometric mean of the length of its diagonals. The degree measure of the acute angle of the rhombus is (a)`15^0` (b) `30^0` (c) `45^0` (d) `60^0`

The acute angle of a rhombus whose side is a mean proportional between its diagonals is

If the hypotenuse of a right-angled triangle is four times the length of the perpendicular drawn from the opposite vertex to it, then the difference of the two acute angles will be 60^0 (b) 15^0 (c) 75^0 (d) 30^0

If the two sides of rhombus are x+2y+2=0 and 2x+y-3=0, then find the slope of the longer diagonal.

Given relative error in the measurement of length is 0.02, what is the percentage error?

L_1a n dL_2 are two lines. If the reflection of L_1onL_2 and the reflection of L_2 on L_1 coincide, then the angle between the lines is (a) 30^0 (b) 60^0 (c) 45^0 (d) 90^0

The length of a body is measured as 3.51m, if the acuracy is 0.01 m, then the percentage errof in the measurement is

Two sides of a rhombus lying in the first quadrant are given by 3x-4y=0a n d12 x-5y=0 . If the length of the longer diagonal is 12, then find the equations of the other two sides of the rhombus.

If (-4,7) is one vertex of a rhombus and if the equation of one diagonal is 5x-y+7=0, then find the equation of another diagonal.

If in the two circles, arcs of the same length subtend angles 30^0 and 40^o at centre, find the ratio of their radii: