SaiBook.us Measurement

Home Course Section

Schedule Admission Social

Lesson Example Discussion Quiz: Class Homework

Step-3

Title: Area and Perimeter

Grade: 6-a Lesson: S2-L2

Explanation: Hello Students, time to practice and review the steps for the problem.

Lesson Steps

Step	Type	Explanation	Answer
1	Problem	The perimeter of an isosceles triangle is 19 units. Find out the length of the third side of the triangle if the equal sides measure 4 units each.
2	Step	The given perimeter of the isosceles triangle and the sides of a triangle are	19 units and 4 units
3	Formula:	The perimeter of a triangle is the sum of the lengths of its three sides, so you can write an equation	Perimeter = A + B + C
4	Step	Substitute the given values in the formula	19 = 4 + 4 + C
5	Step	After simplification	19 = 8 + C
6	Step	Find the C value	C = 11 units
7	Step	The length of the third side of the triangle is C = 11 units
8	Sumup	Can you summarize what you’ve understood in the above steps?
9	Choice.A	This is incorrect, as the correct length is 11 units	10 units
10	Choice.B	This is incorrect, the unit should be "units" for length, not \$cm^2\$ which represents area	\$11 cm^2\$
11	Choice.C	This is incorrect, the unit should be "units" or "meters" for length, not "m," which is not consistent	11 m
12	Choice.D	This is correct because it correctly represents the length of the third side in units, which is 11 units	11 units
13	Answer	Option	D
14	Sumup	Can you summarize what you’ve understood in the above steps?

Step

Type

Explanation

Answer

Problem

The perimeter of an isosceles triangle is 19 units. Find out the length of the third side of the triangle if the equal sides measure 4 units each.

Step

The given perimeter of the isosceles triangle and the sides of a triangle are

19 units and 4 units

Formula:

The perimeter of a triangle is the sum of the lengths of its three sides, so you can write an equation

Perimeter = A + B + C

Step

Substitute the given values in the formula

19 = 4 + 4 + C

Step

After simplification

19 = 8 + C

Step

Find the C value

C = 11 units

Step

The length of the third side of the triangle is C = 11 units

Sumup

Can you summarize what you’ve understood in the above steps?

Choice.A

This is incorrect, as the correct length is 11 units

10 units

Choice.B

This is incorrect, the unit should be "units" for length, not \$cm^2\$ which represents area

\$11 cm^2\$

Choice.C

This is incorrect, the unit should be "units" or "meters" for length, not "m," which is not consistent

11 m

Choice.D

This is correct because it correctly represents the length of the third side in units, which is 11 units

11 units

Answer

Option

Sumup

Can you summarize what you’ve understood in the above steps?