Use a calculator. The sine of 78 degrees is .98.
The bottom line in the red triangle is 3 units long.
The top line of the blue triangle is 6 units long.
Divide the larger by the smaller to get the scale factor: 6 / 3 =2
The scale factor is 2
84/12 is 7 so it’s 7 feet and to find out how many inches, you have to subtract 84-75 which is 9 that that’s 9 inches
7 feet and 9 inches
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