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April 17, 2014

Posted by **chinnu** on Wednesday, August 31, 2011 at 2:54pm.

(A) 9cm

(B) 128cm

(C) 80cm

(D) 56cm

plz do explain how to find.

thank you

- maths -
**Ms. Sue**, Wednesday, August 31, 2011 at 3:10pmA rhombus is made up of four right angle triangles.

http://www.coolmath.com/reference/rhombus.html

The two sides of each triangle are 12 cm and 16 cm.

Use the Pythagorean Theorem to find the hypotenuse of each triangle, which is also the side of the rhumbus.

a^2 + b^2 = c^2

12^2 + 16^2 = c^2

144 + 256 = c^2

400 = c^2

20 = c

4 * 20 = perimeter of rhombus

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