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  • Brainly User
2016-02-17T14:33:14+08:00
Length of I = [(52 cm / tan 30°) - (12 cm / tan 30°)] + (52 cm / tan 68°)
                  = [(52 cm / 0.577) - (12 cm / 0.577)] + (52 cm / 2.475)
                  = [90 cm. - 21 cm.] + 21 cm
                  = 69 cm + 21 cm
                  = 90 cm

ANSWER: The length I is 90 cm.

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2 5 2
thanks for that picture and explanation
You're welcome :-)