John should drive to his workplace and back to home. On the way to the workplace it was raining, so he drove at speed of 42mph.
1 answer:
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First
angle in front of c is 30°, so hypotenuse is equal to 2c
it's right triangle, so let's use Pythagorean theorem\
Second
b - the base of the triangle, angles at the base are equal ⇒ cathets are equal
it's right triangle, so let's use Pythagorean theorem