Sunday

March 29, 2015

March 29, 2015

Posted by **ashley --** on Tuesday, April 26, 2011 at 2:07pm.

- trig -
**MathMate**, Tuesday, April 26, 2011 at 2:28pmThe longest diagonal forms a triangle with 180°-40°=140° and adjacent sides of 42 and 36 cm.

Using the cosine rule:

C²=A²+B²-2ABcos(α)

=42²+36²-2*42*36*cos(140°)

=1764+1296-3024(-.766044443)

=5376.52 approx.

C=sqrt(5376.52)

=73.32 cm (approx.)

**Answer this Question**

**Related Questions**

math - THe area of a parallelogram is 594, and the lengths of its sides are 32 ...

Pre-calculus - Find the lengths of the diagonals of a parallelogram with ...

math - The sides of a parallelogram are 15 ft and 17 ft. One angle is 40° while ...

maths - two adjacent sides of a parallelogram measure 15 cm and 20 cm while the ...

geometry theorems - I have six questions which will be on a test two weeks from ...

trig - A kite is in the shape of a quadrilateral with two pair of congruent ...

geometry - In parallelogram ABCD, BC = 8, DC = 12, and measure of angle D is 50 ...

Trig-Algebra help asap - The adjacent sides of a parallelogram measure 8 cm and ...

geometry - The measure of an angle of a parallelogram is 12 degrees less than 3 ...

geometry - the measure of an angle of a parallelogram is 12 degrees less than 3 ...