Step-by-step explanation:
Area is 12*5=60
Height is 4
Perimeter is 2*17=34
Surface area=120+136=256
Answer:
Option C
Step-by-step explanation:

Hope this helps.
Answer:
A. 19.5
Step-by-step explanation:
Diagonals of a rhombus intersect at right angles. Therefore the angle opposite to AD = 90°.
Thus:
90° + x + 3x + 12 = 180° (sum of ∆)
Add like terms
102 + 4x = 180
Subtract 102 from each side
4x = 180 - 102
4x = 78
Subdue both sides by 4
x = 19.5
180 - (61+29) = 90
The answer is 90