# Activity for sin(a+b) formula

- Author:
- Gary Rubinstein

## Question 1

Which segment is ?

## Question 2

Which segment is ?

## Question 3

Which segment is ?

## Question 04

Which segment is ?

## Question 5

Which segment is ?

## Question 6

Which segment is ?

## Question 7

What is an expression in terms of and for the length of GB? Hint: Use right triangle ABG.

## Question 8

If angle CAD is degrees what can you say about the measure of angle FEG?

## Question 9

Write an expression in terms of and for the length of EF? Hint: Use right triangle EFG

## Question 10

In question 6, you should have found that segment EI can be called . But EI is also the sum of EF+FI=EF+GB. What is another (more complicated) expression for the length of EI?