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Leokris [45]
3 years ago
11

In trapezoid ABCD, find m∠A if m∠B= 25°, m∠C = 155° and m∠ D= 117°.

Mathematics
1 answer:
telo118 [61]3 years ago
6 0
Hello there! A trapezoid is a quadrilateral, and the angles of a quadrilateral have a sum of 360°. We don't know the angle measurement for A, so let's start off by adding the measurements of the other angles together. 117 + 155 + 25 is 297. Now, we subtract that number from 360 to find the angle measurement. 360 - 297 is 63. There. The measurement of angle A is 63°.
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Explanation:
using the
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y
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−
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→
(
1
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y
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(
2
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since both equations are expressed in terms of x we

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add 2x to both sides
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=
−
2
x
+
2
x
+
4
⇒
3
x
−
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add 5 from both sides
3
x
+
5
−
5
=
4
+
5
⇒
3
x
=
9
divide both sides by 3
3
x
3
=
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3
⇒
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substitute this value in
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