AB = AD and BC = DC are given. Furthermore, we can see that AC = AC by the reflexive property. We have three pairs of congruent corresponding sides, which allows us to use the SSS congruence theorem. From that, we would use CPCTC to conclude that angle B is congruent to angle D.
CPCTC = corresponding parts of congruent triangles are congruent.
For this you will use a^2+b^2=c^2
So 21 would be your c^2 and 9 your b^2 so now it'll look like this
A^2+9^2=21^2
A^2+81=441
next you move the 81 over so you subtract 81 from both sides and you're left with
A^2=360
after you get the square root so a=18.9
and rounded you're answer would be B. 19 feet
Hope this helped :)
Answer:
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Step-by-step explanation:
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The theoretical probability of getting two tails on two coin tosses is 0.25.
<h3>How to calculate the probability?</h3>
The theoretical probability is the ratio of the number of favorable outcomes to the number of possible outcomes. Given a coin is tossed twice.
We have to find the theoretical probability of tossing two tails. The probability of getting tails on the toss of a coin is 1/2 0r 0.5.
Therefore, the probability of getting two tails on two coin tosses is 0.5 × 0.5 or 0.25.
The theoretical probability that a coin toss results in two heads showing is 0.25.
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