How to find an angle in a rhombus
ISEE Upper Level Quantitative Reasoning · Learn by Concept
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ISEE Upper Level Quantitative Reasoning › How to find an angle in a rhombus
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1
Consider the rhombus below. Solve for .

CORRECT
Explanation
The total sum of the interior angles of a quadrilateral is degrees. In this problem, we are only considering half of the interior angles:
2

Note: Figure NOT drawn to scale.
The above depicts a rhombus and one of its diagonals. What is ?
CORRECT
Explanation
The diagonals of a rhombus bisect the angles.
The angle bisected must be supplementary to the angle since they are consecutive angles of a parallelogram; therefore, that angle has measure
, and
is half that, or
.