# Maple TA: Calculating an Angle, and the Area

Attached are two maple TA problems I would like to understand which one is a correct answer and all possible additional notes explain why.

Question 1:

Please select all correct formulas below that can be used for calculating the angle ? between two vectors a,b:

(See attached for the equations)

Question 2:

Consider the triangle with vertices A,B,C and let ? be the angle at the vertex A. Please select all correct formulas for calculating area of the traingle:

(See attached for the equations)

https://brainmass.com/math/geometric-shapes/maple-ta-calculating-angle-area-522135

#### Solution Preview

Q1 (a) and (e)

For a), as the module of the cross product of a and b is equal to the area of the parallelogram, which ...

#### Solution Summary

The expert calculates an angle and the area using Maple.

$2.19