4
Answer: ASet 4: Triangles (Beginner)
Explanation
PROBLEM
A triangle has sides 4, 5, and 9. What is its perimeter?
A triangle has sides 4, 5, and 9. What is its perimeter?
A.✓ Correct
18
B.
19
C.
21
D.
16
Detailed Explanation
Choice A is the best answer. Perimeter = 4 + 5 + 9 = 18
Why others are wrong:
B: 19 is incorrect because it does not satisfy the equation.
C: 21 is incorrect because it does not satisfy the equation.
D: 16 is incorrect because it does not satisfy the equation.