4. Find the area of each of the following triangles. (i)
5 cm 9 cm
(ii) (iii) 6 cm
8 cm
5. What type of triangles are shown in these pictures? (i)
(ii)
(iv) 134 cm 203 cm 98 cm 56 cm 96 cm 142 cm
56 cm 63 cm
8.5 m
6. Find the perimeter of each triangle. (i)
185 cm 41 cm 159 cm
(ii) (iii) 185 cm
177 cm 9 cm 87 cm
7. A swan fl ies straight from Galway to Birr, from Birr straight to Limerick, and from Limerick straight to Galway.
The distance travelled by the swan from Galway to Birr was 90 km. The distance travelled by the bird from Birr to Limerick was 70 km. The total distance travelled by the swan was 250 km.
(i) Find the distance travelled by the swan between Limerick and Galway.
(ii) What type of triangle is traced out by the path of the swan?
(iii) Using an appropriate scale, draw a scale diagram of the triangle from part (ii).
(iv) 7 cm 4 cm 12 cm 14 cm 4 cm
8. A section of wallpaper is made out of triangles as shown. Find the total area covered by this section of wallpaper.