Question

I need help with two isosceles and equilateral triangle questions (high school) - http://prnt.sc/dmb6ne

Answer 1

this is an isosceles triangle what mean that these two angles of the base are equal

so in this case you write

50 =2x

x = 25

using this knowledges and you know that the sum of measure of angles of a triangle is equal 180 degrees

- from this that the sum of angles of the base equal 100 so this mean thet this angle from the top is equal 80

making this expression of 5y+10 =80 result

5y = 70

y = 14

hope helped and that you understand the way how you get this answer easy