Math Is Fun Forum

I can't see the figure you are talking about so I don't know about 6 to 10.

11. Pythagorean theorem states that if a triangle us right angled it's a^2+b^2=c^2 where the hypotenuse is c and the shorter sides are a and b. So if the hypotenuse is 5 and one of the sides are 3 we get, 3^2+b^2=5^2.therefore b is 4 and the statement is true.

13.It always does.The statement is true.

12.Angles in a triangle add up to 180 so the last angle is 180-50 or 130 degrees.So the statement is true.

14.The statement is wrong the angle at the edge of a circle are double that of the circumference.So the arc it defines is 60 degrees.

15.The formula for the area of a circle is pir^2 and the surface area of a sphere is 4pir^2.So the statement is true

16.The statement is true

17.Yes because the distance from the midpoint to a point on a circle is always the same.

18.Yes because -4--2=-2 and 4--3=7 and pythagorean theorem states that a^2+b^2=c^2 so 49+4= c^2 or c =sqrt(53).

19.No because
For it to be a right angled triangle the point that is on a different point on the x/y axis has to have one common coordinate.Which it dosen't.

20.No because some of the points are 4 away from eachother where as others are 9 away.