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Sedaia [141]
3 years ago
13

Pls answer the questions marker in read

Mathematics
1 answer:
ladessa [460]3 years ago
6 0

Answer:

6:120

7:100

10:40  50 90

Step-by-step explanation:

6:sum of internal angle of triangle is equal to exterior angle

7:10^2=100

10:let angle be x then

    4x+5x+9x=180(sum of all side of triangle)

    or,18x=180

     ..x=10

hence, 4x=40,5x=50,9x=90

11:

     as we know

     side of equilateral triangle is 30

now <c is 30 degree

      so, ,c+<e+<f=180 degree

            hence , its prooved that CDE is equtrilateral triangle

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