Explanation:
Note: #5 is yes being isosceles and #6 is no
isosceles being 2 sides with the same value. Number 1 has that, making that triangle isosceles.
Number 2 is a right triangle, as you can see by that little square in the corner of the triangle. And the fact of it being a perfect 3-4-5 triangle.
3 is an obtuse because one angle is above 90
4 is an acute as all 3 angles are below 90
#7 - All angles must equal 180 in a triangle. Given are 43 and 37. 43+37 = 80.
180 - 80 = 100
Meaning x = 100 degrees