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What is the largest integer value of IK for which parallelogram IJKL will have an acute angle at J?

A.
12
B.
13
C.
14
D.
15

What is the largest integer value of IK for which parallelogram IJKL will have an acute angle at J A 12 B 13 C 14 D 15 class=

Respuesta :

dxdph4pi
IK^2=69-120cos(J)
If J is acute, cos(J) is a positive value, meaning IK^2 must be less than 169 and therefore IK must be less than 13. The greatest value less than 13 is 12, so your answer is A. IK=12.

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