Work is provided in the image attached.
It would be on both planes. When two planes intersect, they form a line along the points at which the two exist in the same place. Point V is said to exist along line s, which came from the intersection of the planes. This means that the point belongs to both of them.
Answer- Yes it is a right triangle.
You can use the Pythagorean Theorem.
( a^2 + b^ = c^2 ) and replace a with 10, b with 24, and c with 26 and the equation will be balanced on both sides.
(10^2 + 24^2 = 26^2)
(100 + 576 = 676 )
56m^2
see the steps from the pic