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Sliva [168]
3 years ago
13

Find the value of Z. A)7 B)9 C)11 D)12

Mathematics
2 answers:
Gala2k [10]3 years ago
4 0
As per the isosceles triangle theorem, if the two base angles are congruent then the legs are also congruent, so we must set the two legs equal to each other:

2z - 15 = 9

Add 15 to both sides:

15 - 15 = 0
15 + 9 = 24

Divide 2 from each side:

2z = 24

2z/2 = z

24/2 = 12

z = 12

Hence, the answer would be D: z = 12

arlik [135]3 years ago
4 0

2z-15=9\\2z=24\\z=12

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Answer:

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Step-by-step explanation:

This problem can be solved using given below property of triangle.

Sum of two sides is always greater than third side of triangle.

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Given

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using the property, Sum of two sides is always greater than third side of triangle.

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=> x  > 1

combining both we have

1 < x < 7.5

out of the given option none is 1 < x < 7.5

hence, correct answer will be 1 < x < 7.5 and wrong option can be claimed by student.

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