The diagram below represents earth and the sun’s incoming rays. letters a, b, c, and d represent locations on earth’s surface.
which two locations are receiving the same
intensity of insolation?
(1) a and b
(2) b and c
(3) c and d
(4) d and b

I think the two locations that receive the same intensity of isolation would be : 4. D and B

They both located at the exact distance between the sun and the center of the earth, and located at the similar angle

The answer for your problem would be a. 7

In a right-angled triangle: 1- the hypotenuse is the longest side2- we can apply pythagorean rule which states that: (hypotenuse)^2 = (side1)^2 + (side2)^2for the given triangle,longest side is 15 cm  side1 = 9 cmside2 is 12 cm  to check whether the triangle is right-angled or not,compare (15)^2 to the summation of (9)^2 and (12)^in other words, compare 225 to the summation of 81 and 144if they are both equal, then the triangle is right-angles, otherwise, it is not.you haven't provided the diagram showing her work, so i cannot tell the choice. however, apply my explanation to the question you have.