We use cookies to personalise content and advertisements and to analyse access to our website. Furthermore, our partners for online advertising receive pseudonymised information about your use of our website. cookie policy and privacy policy.

Amanda has a 2 cm rod, a 5 cm rod, and a 9 cm rod.  She will randomly chooes a fourth rod from a box containing rod of lengths 2, 4, 6, 8, 10, 12, 14, 16, 8, and 20 cm.  What is the probability that Amanda four rods will be able to form a convex quadrilateral, if the rods are to be connected endpoint to endpoint?

 Nov 19, 2019

Do you know what a convex quadrilateral is?  Perhaps you would like to share this knowledge with other forum users.?


Have you tried playing with a rough sketch. If so you will be able to discound some of the possibilies straight away.

Which ones can you discount straight away, and why?

 Nov 20, 2019
edited by Melody  Nov 20, 2019

32 Online Users