Q17) Let ABCD be a convex quadrilateral in E.G. and let O be an interior point of ABCD. If E, F, G,H are the midpoints of the sides AB,CB,CD, AD simultaneously. Assume the areas of the polygonal regions AEOH, EBFO, FCGO and GDHO are a,,y and ß simultaneously. Then:

1. The center and radius of the given circle (x-3) +y+8) - 39 are: %3D A) (3,-8), r= 39 %3D B) (-3,-8), r- 39 C) (-3,8), r = /39 D) (3,-8), - = /39 2 Pts A B.

5. a) Find the area of the triangle formed by the points A(1, 2, -1), B(5, 9, 0) and C(-6, 0, 3). b) Determine the angle between a and b given that â - 56 and â - ɓ are perpendicular.

Prove the area of a rhombus is one-half the product of the lengths of the diagonals.