Question

3. An area problem: The Johnsons are planning to build a 5-foot-wide brick walkway around their rectangular garden, which is 20 feet wide and 30 feet long. What will the area of this walk- way be? Before you solve the problem yourself, use Kaitlyn's idea: a. Kaitlyn's idea is to "take away the area of the garden." Explain how to solve the problem about the area of the walkway by using this idea. Explain clearly how to apply one or both of the moving and additivity principles on area in this case. b. Now solve the problem about the area of the walkway in another way than you did in part (a). Explain your reasoning.
When asked to explain, please do so using 3-5 complete sentences, written out in words. Be thorough in your explanations and address all parts of the problem completely.

Note: This problem is relevant to principles taught first in the 3rd grade, where only the formula of a rectangle is known. Therefore, do not use formulas for any other plane shapes or the Pythagorean Theorem.

Answer 1

kaitlyn oed 600ドレ 40 5 K15 20 j+ 5 kDEL 200 + 200 + lov t 1бъ