Triangle def has vertices d(1, 3), e(3, –1), and f(–2, –1). determine if triangle def is an equilateral, isosceles, or scalene triangle.
a. equilateral
b. isosceles
c. scalene
d. none of these

DEF is a isosceles triangle.

B is correct.

Step-by-step explanation:

Given The vertices of triangle D(1, 3), E(3, –1), and F(–2, –1)

We will find distance or length of each side of triangle using distance formula.

Formula:

Thus, EF=DF=5

If two sides of triangle is equal then it is isosceles triangle.

Hence, DEF is a isosceles triangle.

see explanation

step-by-step explanation:

since the sequence is geometric there is a common ratio r between consecutive terms, that is

r = 4 ÷ - 2 = - 2

r = - 8 ÷ 4 = - 2

r = 16 ÷ 8 = - 2

the next term - 13 must be incorrect as it should be - 32 for the sequence to be geometric.

the first 4 terms are therefore geometric with common ratio r = - 2

answer 1 : option "c"

answer 2 : option "d"

answer 3 : option "b"

answer 4 : option "d"

answer 5 : option "b"

answer 6 : option "a"

answer 7 : option "c"

answer 8 : option "d"

answer 9 : option "c"

answer 10 : option "d"

answer 11 : option "c"

answer 12 option "b"

answer 13 option "c"

answer 14 option "c"

answer 15 option "d"

answer 16 option "a"

answer 17 option "b"

answer 18 option "c"

answer 19 option "a"

answer 20 option "a"

answer 21 option "c"

d