quadrilaterals with 3 acute angles

the initial question is from a KS2 test paper (2016)
the tasks are good practice in using areas of triangles
the powerpoint is here

compound rectangular shapes

this task is from the NCETM teaching for mastery, year 6 resources (page 32)

(slightly adapted)


















Lukas's reasoning took a while to understand....

taking this idea for compound area calculations a little further...