Use the net to determine the total surface area.
the net of a triangular pyramid has an equilateral triangle as its base with edges of 12 centimeters, lateral edges of 12 centimeters, and lateral height of 10.4 centimeters is laid flat.

249.6 cm2

499.2 cm2

108 cm2

278.4 cm2

step-by-step explanation: yes

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.