Lesson 7.77.7 Small Group · Group 1
Group 1 · Set BSecond form · new problems, same idea
Learning target With my small group, I can draw polygons from their vertex coordinates on the coordinate plane, and use coordinates to find side lengths and solve perimeter and area problems — one step at a time, with support.
Remember7.7 Small Group · Group 1
Vertices that share a coordinate form a side, and the side lengths from the coordinates give the perimeter. Plot the vertices and connect them in order. Two vertices that share a coordinate give a side length.
Words: vertex (vértice)polygon (polígono)perimeter (perímetro)distance between vertices (distancia entre vértices)scale (escala)
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1Complete each step, then write the final answer.
A rectangle has vertices (−3, 4), (2, 4), (2, 1) and (−3, 1). Find its perimeter.
Show your workHint Find the side from (−3, 4) to (2, 4) and the side from (2, 4) to (2, 1). Each length appears twice.
Final answer: -
2Complete each step, then write the final answer.
A rectangle has vertices (−3, 6), (3, 6), (3, 2) and (−3, 2). Find its perimeter.
Show your workHint Find the side across and the side up and down. Then add all four sides.
Final answer: -
3Complete each step, then write the final answer.
A soccer field on a map has corners (−50, 30), (50, 30), (50, −30) and (−50, −30). Each unit is 1 yard. How many yards is it around the field?
Show your workHint "Around the field" means perimeter. Each side crosses an axis.
Final answer: -
4Complete each step, then write the final answer.
A triangle has vertices (−2, −1), (4, −1) and (4, 3). Find its area.
Show your workHint The base goes across and the height goes up and down. A triangle is half of a rectangle.
Final answer:
Explain your thinkingSam added only two sides. Why must you count each length two times for the perimeter of a rectangle?
Sentence starter Sam forgot ___. · Each length counts two times because ___.