Yea what she said was correct
An area That rises above surrounding landforms and has a rounded top; lower and usually less steep than a mountain. ... A high, flat-topped landform with cliff-like sides; larger than a butte.
Hope this helps!
No.
A chord is a straight segment that joins two points of the circumference. It starts at a point in the circumference and ends at other point in the circumference.
The radius goes from the center of the circle (which is not on the circumference) to one point of the circumference.
The diameter is a chord (the largest chord possible); but not the radius.
Using complementary angles, <X is equal to <Z, so it's <Z = 35°.