I think the answer is 3,-7
So 1st consider that it's a square! That's very important. So for a square, all 4 sides are equal.
And now considering that the given information is the diameter. So any angle made at the circle extended from the 2 points of diameter gives an angle of 90°
Now consider one triangle. So we already know that 2 sides of the triangle are equal (because they are 2 sides of a square) , has a side of 10 (diameter) and and angle of 90°. So remaining 2 angles are 45°
Now solve it by applying
1 meter is greater then 83 cm Because if you divide it will be 0.83 and the differences will be 0.17
40 km - meters is 40 * 1000 whch is 40000 meters per hour