Answer:
b,c,d
Step-by-step explanation:
the box on the corner means it is 90°.
the lines make a T shape meaning one line is going straight up and down and the other is going left and right. this is called perpendicular. we also know it is since we have right angles of 90° on each corner.
right angles means they are 90°
acute angles are any angles smaller than 90. since it is exactly 90 it is not acute.
