Answer:
not idea sorry but 4 no is idea it can be solve the 10 std
The measure of the fourth angel is 87°
The length of the rectangle is 16.
Answer:

Step-by-step explanation:
move variable to the right-hand side and change its sign

divide both sides of the equation

Answer:
the length of the third side (the hypotenuse) is 7
Step-by-step explanation:
Solve this by using the Pythagorean Theorem:
(2√10)² + 3² = (hypotenuse)²
Then (hypotenuse) = √(40 + 9) = √49 = 7