In a school, 10% of the students have green eyes. Find the experimental probability that in a group of 4
students, at least one of them has green eyes.
The problem has been simulated by generating random
numbers. The digits 0-9 were used. Let the number "9"
represent the 10% of students with green eyes. A sample
of 20 random numbers is shown.

m∠a is 90°

m∠b is 40°

isocolese triangle

we know that the line connect a and b is the hyptonuse

so first find the hypotonuse length using the distance formula, call the length c

since it is an isocolese triangle, the lengths of the legs are the same

using pythagorean theorem,

in this case, a=b since isocolese triangle so we get

or

we can find c so we can find the distances

we know that if we draw 2 circles, each has center at a and b, and find where they intersect, we can the 2 possible locations for c

if a has center at (xa,ya) and b has center at (xb,yb), then we can solve where

and

intersect to find where they intersect

i'm not going to put an example because i have to go to class. i hope this explanation is enough