"All congruent triangles are similar, but all similar triangles are not congruent". Justify please!​

True similar triangles don't have to be the same size

Step-by-step explanation:

Congruent means that the triangles are exactly the same in size and shape whereas similar means that the triangles have the same shape, but not the same size. Hope this helps!

2. angles qrt and qst both measures 156 degrees.

step-by-step explanation:  

we have been given a diagram of a circle and we are told that measure of arc qvt is 156 degrees.  

we can see from our given diagram that angle qrt and angle qst subtends to arc qvt.

since we know that angles subtended by the same arc at the circumference are always equal.

by angle subtended by same arc theorem, measure of angle qrt and angle qst will be equal to the measure of arc qvt.

therefore, angles qrt and qst both measures 156 degrees and 2nd statement is the correct choice.