If ABCD is a cyclic parallelogram, then the is
C.
As we all know, the sum of opposite angles of cyclic quadrilateral is .
i.e.
and
But ABCD is a cyclic parallelogram
∴
AC is a chord of circle whose centre is at O. If B is any point on the arc AC and , then the magnitude of is
The coordinates of the vertices of a right angled triangle are P(3, 4), Q(7, 4) and R(3, 8), the right angle being at P. The coordinates of the orthocentre of are
(3, 4)
(7, 4)
(3, 8)
(3, 8)
The shadow of a tower standing on a level ground is found to be 40 m longer when the sun's altitude is , then when it is . Find the length of the tower.
10 m
20 m
20 m
The length of a shadow of a tower is 9 m when the sun's altitude is . What is the height of the tower?