Math help..?

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The diagram of a parrollegram (rhombus) ABCD. mB=5X mC=2x+12. What is the degrees for mD....
Been wrkin on this problem for a day and cant seem to get it.,.Your help is needed..thank u

2007-12-26 23:42:29 · 3 answers · asked by Anonymous in Education & Reference ➔ Homework Help

3 answers

Angles B and C are supplementary, thus add up to 180.

5x + 2x + 12 = 180

7x + 12 = 180

7x = 168

x = 24

mB = 5(24) = 120

mD = mB = 120 (opp. angles of a parallelogram are congruent)

2007-12-26 23:58:25 · answer #1 · answered by jenh42002 7 · 0⤊ 0⤋

B and C add to 180:

5x + 2x + 12 = 180
7x = 168
x = 24

D = B: 5x = 5*24 = 120

2007-12-27 07:59:45 · answer #2 · answered by fcas80 7 · 0⤊ 0⤋

i don understand the questions...

2007-12-27 07:48:57 · answer #3 · answered by Anonymous · 0⤊ 1⤋