Atriangle is formed between bob and 2 lampposts. the distance from bob to one lamppost is 25 feet, and the distance from bob to the other lamppost is 30 feet. the distance between the 2 lampposts is 20 feet.
bob is standing 25 feet from a lamppost that is to his left and 30 feet from a lamppost that is to his right. the distance between the two lampposts is 20 feet. what is the measure of the angle formed from the line from each lamppost to bob? approximate to the nearest degree.

1. 202 = 252 + 302 − 2(25)(30)cos(a)

2. 400 = 625 + 900 − (1500)cos(a)

3. 400 = 1525 − (1500)cos(a)

4. −1125 = −(1500)cos(a)

degrees

Juliana says that she can use the patterns of equivalent ratios in the multiplication table below to write an infinite number of ratios that are equivalent to 6: 10. which statement explains whether juliana is correct? she is correct because she can multiply 6 and 10 by any number to form an equivalent ratio. she is correct because 6: 10 can be written as 1: 2 and there are an infinite number of ratios for 1: 2. she is not correct because the multiplication table does not include multiples of 10. she is not correct because 6: 10 is equivalent to 3: 5 and there are only 9 ratios in the multiplication table that are equivalent to 3: 5.

Atriangular field has sides of lengths 21, 39, and 41 yd. find the largest angle. (round your answer to the nearest degree.)

Plz ( true - false) all triangles have interior angles whose measure sum to 90.