ABCD is a rhombus whose diagonals interesct at O. If AB=10 cm, diagonal BD = 16 cm, find the length of diagonal AC.

11

ABCD is a rhombus and its diagonals intersect at O.

(i) Is ΔBOC≅ΔDOC? State the condruence condition used?

(ii) Also state, if ∠BCO =∠DCO.

12

Show that each diagonal of a rhombus bisects the angle through which it passes.

14

The diagonal of a quadrilateral are of lengths 6 cm and 8 cm. If the diagonals bisect each other at right angles, what is the length of each side of the quadrilateral?

1

Which of the following statements are true for a rectangle?

(i) It has two pairs of equal sides.

(ii) It has all its sides of equal length.

(iii) Its diagonals are equal.

(iv) Its diagonals bisect each other.

(v) Its diagonals are perpendicular.

(vi) Its diagonals are perpendicular and bisect each other.

(vii) Its diagonals are equal and bisect each other.

(viii) Its diagonals are equal and perpendicular, and bisect each other.

(ix) All rectangles are squares.

(x) All rhombuses are parallelograms.

(xi) All squares are rhombuses and also rectangles.

(xii) All squares are not parallelograms.