In the given problem, apply your knowledge in algebra and basic math specially in perimeter of a rectangle and it's ratio.
Formula for perimeter of a rectangle is 2L + 2W.
Given:
A picture frame is 60 cm long and 10 cm wide.
Solution:
Step 1: Find the perimeter of a picture frame.
P = 2l + 2w
P = 2(60) + 2(10)
P = 120 + 20
P = 140 cm
Step 2: Identify the ratio of its lenght to its perimeter
Ratio → Length: Perimeter
Length is the longest side → 60 cm
Length: Perimeter = 60:140
Step 3: Simplify (lowest term)
60:140 ÷ 20:20 = 3:7
Ratio = 3:7
Answer: D. 3:7
Learn more about perimeter here at https://brainly.ph/question/8805608
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