Checkpoint: values, relations and the identity

An equilateral triangle has side 4. What is tan 60°?

• 1/√3
• √3/2
• √3

sin A = 8/17 and cos A = 15/17. What is tan A?

• 15/8
• 8/15
• 17/8

What is sin²30° + cos²30°?

• 1/2
• 1/4
• 1

A triangle gives sin A = 7/25. What is cos A?

• 24/25
• 18/25
• 25/7

A solution says sin A + cos A = 1 for every acute A. Is that true?

• Yes, but only at 45°
• No. At 45° it is √2, not 1
• Yes, it matches the identity