# Trig

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angle b=25 degrees, angle c=90
AB= 25

a. Find the length of side b to two decimal places.

b. Find the length of side a to two decimal places in three different ways.

• Trig -

Basic application of your simple right-angled triangle properties ....

AC/25 =sin25°
AB = 25sin25 = 10.57

BC/25 = cos25°
BC = 22.66

BTW, the usual convention is to label the vertices of the triangle using capitals and label the side opposite a vertex with the corresponding small letter.
e.g. For triangle ABC
C = 90° , B = 25° and c=25

• Trig -

thanks! :)

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