The problem asks to find the measure of angle D in a kite ABCD, where angle A is $36^{\circ}$ and angle C is $70^{\circ}$.

GeometryKiteAnglesQuadrilateralsAngle Sum Property
2025/3/13

1. Problem Description

The problem asks to find the measure of angle D in a kite ABCD, where angle A is 3636^{\circ} and angle C is 7070^{\circ}.

2. Solution Steps

A kite is a quadrilateral. The sum of the interior angles of any quadrilateral is 360360^{\circ}. In a kite, one diagonal is the perpendicular bisector of the other. Also, a kite has two pairs of adjacent sides that are congruent. Moreover, the angles between non-congruent sides are congruent. In kite ABCD, since AB = BC, and AD = CD, we have D=B\angle D = \angle B.
We know that the sum of the interior angles of a quadrilateral is 360360^{\circ}. Thus,
A+B+C+D=360\angle A + \angle B + \angle C + \angle D = 360^{\circ}.
Given that A=36\angle A = 36^{\circ} and C=70\angle C = 70^{\circ}, and also B=D\angle B = \angle D, we can substitute these values into the equation:
36+B+70+D=36036^{\circ} + \angle B + 70^{\circ} + \angle D = 360^{\circ}.
Since B=D\angle B = \angle D, let B=D=x\angle B = \angle D = x.
36+x+70+x=36036^{\circ} + x + 70^{\circ} + x = 360^{\circ}.
2x+106=3602x + 106^{\circ} = 360^{\circ}.
2x=3601062x = 360^{\circ} - 106^{\circ}.
2x=2542x = 254^{\circ}.
x=2542x = \frac{254^{\circ}}{2}.
x=127x = 127^{\circ}.
Therefore, D=127\angle D = 127^{\circ}.

3. Final Answer

mD=127m\angle D = 127^{\circ}

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