Answer: Last Option
Step-by-step explanation:
Cramer's rule says that given a system of equations of two variables x and y then:
For this problem we know that:
Solving we have:
Solving we have:
Solving we have:
Finally
8 x 6 = 8 x(5 + [] ) = (8 x 5) + (8 x [] ) = 40 + [] = []
1 answer:
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Answer : The correct options are:
DE + EF > DF
5 < DF < 13
Δ DEF is a scalene triangle.
Step-by-step explanation :
As we know that there are three types of triangle.
(1) Equilateral triangle : It is a triangle in which the three sides and angle are equal.
(2) Isosceles triangle : It is a triangle in which the two sides and two angle are equal.
(3) Scalene triangle : It is a triangle in which the three sides and angle are not equal.
Now we have to determine the length DF.
using Pythagoras theorem:
The length DF = 8.06 unit
So, we can say that:
DE + EF > DF
Hence, from the given options we conclude that, the correct options are:
DE + EF > DF
5 < DF < 13
Δ DEF is a scalene triangle.
