Test
Cosine rule
Preguntas del test (4)
1Please select any/all of the equations that represent the cosine rule.
- Aa²=b² -c² + 2ab² cos(A)
- Bb² =a² + c² - 2ac cos(B)
- Ccos(C)=a² +b² -c² / 2ab
- Da² =b² + c² -2bc cos(A)
2This is a worked example so you know what to do later on (if you didn't already know)
Q:Find the length of BC.
(Please select the correct working and answer)
- AWe want the length a so we use the equation in the form: a² =b² +c² -2bc cos(A), so
a² =7² +3² -2*7*3 * cos(35),
a² =58 - 42 * cos(35)
a² =23.595 (approximately) - Ba=4.86
- Ca=6.42
- AWe want the length a so we use the equation in the form: a² =b² +c² -2bc cos(A), so
3Work out the size of angle B.
- A50.7°
- B50.824°
- C33.6°
4Work out the length of AB.
- A6.2cm
- B13.1cm
- C6.8cm
Información
- Descripción
- Test sobre Cosine rule, creado por Tom Woollin el 04/10/2017.
- Autor
- Tom Woollin
- Idioma
- English
- Visitas
- 55
- Etiquetas
- Valoración
- 4,0 de 5 · 1 valoración Valora este test