Answer:
128.7
Step-by-step explanation:
81.90 ÷ 7 = 11.7
11.7 x 11 = 128.7
Consider the triangle with sides a=1.6, b=2.3 and c=1.2 feet. You can use cosine theorem twice to find two unknown angles:
1.
Then you can conclude that ∠B is obtuse (because 
) and m∠B=110°.
2.
.
Then you can conclude that ∠C is acute (because 
) and m∠C=29°.
3. m∠A+m∠B+m∠C=180°, then m∠A=180°-110°-29°=41°.
Answer: m∠A=41° (∠A is opposite to the side a=1.6), m∠B=110° (∠B is opposite to the side b=2.3) and m∠C=29° (∠C is opposite to the side c=1.2)
The symmetry line is passing through points F and E. Then the correct option is B.
<h3>What is reflectional symmetry?</h3>
Consider a plane. Consider a design or shape on that plane. Now consider an axis.
If we think of that axis as a mirror, and on the opposite side of that axis create the image of the considered shape, then if the shape's image looks exactly like the shape itself, then that shape is called to have reflectional symmetry.
Then the symmetry line is passing through points F and E. Because F and E are the mid-points of AD and BC.
Learn more about symmetry here:
brainly.com/question/7783612
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