exam Maths Puzzle Numerical Ability

Indicate whether the problem is true or false but please shoe me how you got the answer cos(theta) = 1/sec(theta)

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exam Other Question

The perimeter of an isosceles triangle is 100 centimeters. If two sides are equal length and the third side is 10 centimeters longer than the others, find the length of the three sides page30 #'s 1-18
textbook title:holt pre algebra
ISBN:0-03-069609-7