Checkpoint: corners, shapes, mirrors and circles

A triangle has corners (0, 0), (6, 0) and (0, 8). Is there a right angle?

• Yes, since 36 + 64 = 100
• No, since the long side is slanted
• Yes, since 6 + 8 = 14

A shape has diagonals with squares 50 and 50. They share one midpoint. What name fits best?

• A rectangle, since the diagonals bisect each other and are equal
• A rhombus, since the diagonals match
• A trapezium, since the diagonals are equal

What is the image of (−5, 4) in the x-axis?

• (5, −4), since both numbers flip
• (−5, −4), since the up number flips
• (5, 4), since the across number flips

A circle has centre O and radius 10. Where is the dot (6, 8)?

• Outside, since 6 + 8 = 14 is more than 10
• Inside, since 6 and 8 are each less than 10
• On the circle, since 36 + 64 = 100