1. The diamter is a straight line that touches both sides of the circle and is in the middle.
The diameter is C. BT because it touches both sides and is in the middle.
Answer = C. BT
2. The angle is acute because it is less than 90°.
Obtuse = Greater than 90°
Acute = Less than 90°
Straight = Measures exactly 180° and is a straight line
Right = Equal to exactly 90° and the angle is the shape of a square.
Answer = B. Acute
~Hope this helped~