Answer:
54.5°
Step-by-step explanation:
You know that in a right triangle, the sine of an angle is given by ...
Sin = Opposite/Hypotenuse
sin(D) = EF/ED = 57/70
The inverse sine function is used to find the angle:
∠D = arcsin(57/70)
∠D ≈ 54.5°
yes, 360/4 = 90 minutes
36+32 << multiply
68 << add
679476947 + 387947597 =1067424544
Hope this helps :)