Question

the perimeter of a isosceles triangle is 30cm. which of the following cannot be the length of the base. a) 1. b) 5. c) 10 d) 15​

Answer 1

Step-by-step explanation:

Let the congruent sides of an isosceles △ be x.

Let the base of the isosceles △ be y

According to the 1st condition,

x+x+y=30

2x+y=30

According to the 2nd condition

x=y+3

x−y=3

Solving equation (1) and (2)

2x+y=30

x−y=3

-------------------

3x=33

x=

3

33

x=11

By substituting x=11 in equation (1)

2x+y=30

2(11)+y=30

22+y=30

y=30−22

=8

∴ The length of the sides of a △ are 11cm,11cm and 8cm.

Answer 2

Answer:

Step-by-step explanation: