Answer:
200√3
Step-by-step explanation:
The triangle given here is a special right triangle, one with angles measuring 30-60-90 degrees. The rule for triangles like these are that the side opposite the 30° angle can be considered x, and the side opposite the 60° angle is x√3, while the hypotenuse, or side opposite the right angle, is 2x. All we need to know here are the two legs to find the area.
Since b is opposite the 30° angle, it is x, while side RS is opposite the 60° angle, meaning it is equal to x√3, meaning that the area of the triangle is 1/2*x*x√3. We can substitute in 20 for x, making our area 1/2*20*20√3. Multiplying we get 10*20√3, or 200√3.
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➷ 'm' is the slope or gradient of the line
'c' is the y intercept (where the line crosses the y axis)
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Explicit formula for the sequence 29,20,11....... is 
Given :
term of the sequence 29, 20, 11, ...
We need to find out the formula for the nth term of the given sequence
Lets find out whether the given sequence is arithmetic or geometric
In the given sequence , common difference is 9

we can say difference =-9
General explicit formula

where a1 is the first term
common difference d=-9
substitute the values

Explicit formula for the sequence 29,20,11....... is 
Learn more : brainly.com/question/23243640